1、Vitreous and porcelain enamels - Preparation of samples and determination of thermal expansion coefficient (ISO 20274:2017)BS EN ISO 20274:2017BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 20274 August 2017 I
2、CS 25.220.50 English Version Vitreous and porcelain enamels - Preparation of samples and determination of thermal expansion coefficient (ISO 20274:2017) Emaux vitrifis - Prparation dchantillons dmail et dtermination du coefficient de dilatation thermique (ISO 20274:2017) Emails und Emaillierungen -
3、Herstellung von Proben und Bestimmung des thermischen Ausdehnungskoeffizienten (ISO 20274:2017) This European Standard was approved by CEN on 22 June 2017. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the s
4、tatus of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three official versions (English, French,
5、 German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cr
6、oatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Tu
7、rkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2017 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members.
8、 Ref. No. EN ISO 20274:2017 ENational forewordThis British Standard is the UK implementation of EN ISO 20274:2017. It is identical to ISO 20274:2017.The UK participation in its preparation was entrusted to Technical Committee STI/36, Vitreous enamel coatings.A list of organizations represented on th
9、is committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2017 Published by BSI Standards Limited 2017ISBN 978 0 580 89993 5ICS
10、 25.220.50Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 October 2017.Amendments/corrigenda issued since publicationDate Text affected BRITISH STANDARDBS EN
11、ISO 20274:2017EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 20274 August 2017 ICS 25.220.50 English Version Vitreous and porcelain enamels - Preparation of samples and determination of thermal expansion coefficient (ISO 20274:2017) Emaux vitrifis - Prparation dchantillons dmail et dtermin
12、ation du coefficient de dilatation thermique (ISO 20274:2017) Emails und Emaillierungen - Herstellung von Proben und Bestimmung des thermischen Ausdehnungskoeffizienten (ISO 20274:2017) This European Standard was approved by CEN on 22 June 2017. CEN members are bound to comply with the CEN/CENELEC I
13、nternal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to
14、any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official
15、 versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Nor
16、way, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2017 CEN All rights
17、 of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 20274:2017 EBS EN ISO 20274:2017EN ISO 20274:2017 (E) 3 European foreword This document (EN ISO 20274:2017) has been prepared by Technical Committee ISO/TC 107 “Metallic and other inorganic coa
18、tings” in collaboration with Technical Committee CEN/TC 262 “Metallic and other inorganic coatings, including for corrosion protection and corrosion testing of metals and alloys” the secretariat of which is held by BSI. This European Standard shall be given the status of a national standard, either
19、by publication of an identical text or by endorsement, at the latest by February 2018, and conflicting national standards shall be withdrawn at the latest by February 2018. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN shall
20、 not be held responsible for identifying any or all such patent rights. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denma
21、rk, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorse
22、ment notice The text of ISO 20274:2017 has been approved by CEN as EN ISO 20274:2017 without any modification. ISO 20274:2017(E)Foreword ivIntroduction v1 Scope . 12 Normative references 13 Terms and definitions . 14 Apparatus . 15 Requirements for the test specimen 16 Preparation of the test specim
23、ens . 26.1 General . 26.2 Production by casting 26.3 Production by drawing out of the melt 26.4 Production by sintering . 37 Determination of the thermal expansion coefficient . 38 Calculation and indication of the results 49 Test report . 4Annex A (informative) Metallic casting mould . 5Annex B (in
24、formative) Drawing from the melt . 6 ISO 2017 All rights reserved iiiContents PageBS EN ISO 20274:2017ISO 20274:2017(E)Foreword ivIntroduction v1 Scope . 12 Normative references 13 Terms and definitions . 14 Apparatus . 15 Requirements for the test specimen 16 Preparation of the test specimens . 26.
25、1 General . 26.2 Production by casting 26.3 Production by drawing out of the melt 26.4 Production by sintering . 37 Determination of the thermal expansion coefficient . 38 Calculation and indication of the results 49 Test report . 4Annex A (informative) Metallic casting mould . 5Annex B (informative
26、) Drawing from the melt . 6 ISO 2017 All rights reserved iiiContents PageBS EN ISO 20274:2017ISO 20274:2017(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is
27、normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part
28、in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular
29、 the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).Attention is drawn to the possibility that some of the elements of this
30、 document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www .
31、iso .org/ patents).Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and expressions related to conformity assessment, as well as inf
32、ormation about ISOs adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following URL: www .iso .org/ iso/ foreword .html.This document was prepared by Technical Committee ISO/TC 107, Metallic and other inorganic coatings.iv ISO 2017 All rights
33、 reservedBS EN ISO 20274:2017ISO 20274:2017(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each memb
34、er body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Ele
35、ctrotechnical Commission (IEC) on all matters of electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types
36、of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be
37、held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www .iso .org/ patents).Any trade name used in this document is infor
38、mation given for the convenience of users and does not constitute an endorsement.For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the World Trade Organization (W
39、TO) principles in the Technical Barriers to Trade (TBT) see the following URL: www .iso .org/ iso/ foreword .html.This document was prepared by Technical Committee ISO/TC 107, Metallic and other inorganic coatings.iv ISO 2017 All rights reserved ISO 20274:2017(E)IntroductionThe thermal expansion coe
40、fficient of enamel and the relevant substrate is an important material characteristic, as it provides information on the stress ratios in the composite material. ISO 2017 All rights reserved vBS EN ISO 20274:2017Vitreous and porcelain enamels Preparation of samples and determination of thermal expan
41、sion coefficient1 ScopeThis document specifies the procedures for the preparation of enamel samples for measurement of the thermal length change and calculation of the thermal expansion coefficient.2 Normative referencesThe following documents are referred to in the text in such a way that some or a
42、ll of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 7991, Glass Determination of coefficient of mean linear thermal expansionI
43、SO 19496-1, Vitreous and porcelain enamels Terminology Part 1: Terms and definitions3 Terms and definitionsFor the purposes of this document, the terms and definitions given in ISO 19496-1 apply.ISO and IEC maintain terminological databases for use in standardization at the following addresses: IEC
44、Electropedia: available at http:/ www .electropedia. org/ ISO Online browsing platform: available at http:/ www. iso. org/ obp4 Apparatus4.1 Standard laboratory instruments, instruments in accordance with ISO 7991 and 4.2 to 4.4.NOTE An optical dilatometer can be used as an alternative to a pushrod
45、dilatometer.4.2 Casting mould made from ceramic, for example, boat made from corundum, porcelain, or casting mould made from metal, for example, tool steel (see Annex A).4.3 Melting crucible made from non-contaminating material, for example, corundum, porcelain, with a height of about 55 mm and a di
46、ameter of approximately 40 mm.4.4 Laboratory furnace, in the temperature range from 800 C to 1 100 C controllable to 5 C.5 Requirements for the test specimenThe test specimen shall be rod-shaped and straight with either an approximately circular cross section with a diameter constant to 1 mm over it
47、s length, or an approximately square cross section with an edge length constant to 1 mm over its length.The diameter or edge length of the test specimen shall correspond 1 mm to the diameter or edge length of the reference sample.INTERNATIONAL STANDARD ISO 20274:2017(E) ISO 2017 All rights reserved
48、1BS EN ISO 20274:2017Vitreous and porcelain enamels Preparation of samples and determination of thermal expansion coefficient1 ScopeThis document specifies the procedures for the preparation of enamel samples for measurement of the thermal length change and calculation of the thermal expansion coeff
49、icient.2 Normative referencesThe following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 7991, Glass Determination of coefficient of mean linear thermal expansionISO 19496-1, Vitreous and porcelain enamels Terminology Part 1: Terms and definitions3 Terms and definition
